A blanet is a member of a hypothetical class of exoplanets that directly orbit black holes.
Blanets are fundamentally similar to other planets; they have enough mass to be rounded by their own gravity, but are not massive enough to start thermonuclear fusion and become stars. In 2019, a team of astronomers and exoplanetologists showed that there is a safe zone around a supermassive black hole that could harbor thousands of blanets in orbit around it.
A mega-Earth or massive solid planet is a proposed neologism for a massive terrestrial exoplanet that is at least ten times the mass of Earth (M🜨). Mega-Earths would be substantially more massive than super-Earths (terrestrial and ocean planets with masses around 5–10 M🜨). The term "mega-Earth" was coined in 2014, when Kepler-10c was revealed to be a Neptune-mass planet with a density considerably greater than that of Earth. However, it has since been determined to be a typical volatile-rich planet weighing just under half that mass.
Mega-Earths or comparable objects may exist as remnant cores of evaporated gas giants or white dwarfs, and may also form around massive stars and supermassive black holes as blanets for the latter.
View the full Wikipedia page for Mega-Earth